<!-- go.dev/issue/65319 -->
The runtime now explicitly flushes trace data when a program crashes due to an
uncaught panic. This means that more complete trace data will be available in a

	a := arena.NewArena()
	defer a.Free()

	const iValue = 10

	i := arena.New[int](a)
	*i = iValue

	if *i != iValue {
		// This test doesn't reasonably expect this to fail. It's more likely
		// that *i crashes for some reason. Still, why not check it.
		log.Fatalf("bad i value: got %d, want %d", *i, iValue)
	}

	const wantLen = 125
	const wantCap = 1912

	sl := arena.MakeSlice[*int](a, wantLen, wantCap)

func FuzzMutator(f *testing.F) {
	// TODO(katiehockman): simplify this once we can dedupe crashes (e.g.
	// replace map with calls to panic, and simply count the number of crashes
	// that were added to testdata)
	crashes := make(map[string]bool)
	// No seed corpus initiated
	f.Fuzz(func(t *testing.T, b []byte) {
		crashes[string(b)] = true
		if len(crashes) >= 10 {
			panic("mutator found enough unique mutations")
		}
	})

apiVersion: release-notes/v2
kind: bug-fix
area: istioctl
releaseNotes:
  - |

  public static void testSubtypeOfStaticAnonymousClass() {
    Class<?> superclass = new Mall<Outdoor>().new Shop<Electronics>() {}.getClass();
    assertTrue(TypeToken.of(superclass).isSubtypeOf(superclass));
    assertFalse(
        TypeToken.of(new Mall<Outdoor>().new Shop<Electronics>() {}.getClass())
            .isSubtypeOf(superclass));
  }

  public static void testSubtypeOfStaticAnonymousClass() {
    Class<?> superclass = new Mall<Outdoor>().new Shop<Electronics>() {}.getClass();
    assertTrue(TypeToken.of(superclass).isSubtypeOf(superclass));
    assertFalse(
        TypeToken.of(new Mall<Outdoor>().new Shop<Electronics>() {}.getClass())
            .isSubtypeOf(superclass));
  }

The [SetCrashOutput] function allows the user to specify an alternate
file to which the runtime should write its fatal crash report.
It may be used to construct an automated reporting mechanism for all
unexpected crashes, not just those in goroutines that explicitly use

package runtime

const (
	_SS_DISABLE  = 2
	_NSIG        = 65
	_SIG_BLOCK   = 0
	_SIG_UNBLOCK = 1
	_SIG_SETMASK = 2
)

// It's hard to tease out exactly how big a Sigset is, but
// rt_sigprocmask crashes if we get it wrong, so if binaries
// are running, this is right.
type sigset [2]uint32

var sigset_all = sigset{^uint32(0), ^uint32(0)}

//go:nosplit
//go:nowritebarrierrec
func sigaddset(mask *sigset, i int) {

		// closing it.)
		//
		// The new fd must be close-on-exec, otherwise if the
		// crash monitor is a child process, it may inherit
		// it, so it will never see EOF from the pipe even
		// when this process crashes.
		//
		// A side effect of Fd() is that it calls SetBlocking,
		// which is important so that writes of a crash report
		// to a full pipe buffer don't get lost.
		fd2, _, err := poll.DupCloseOnExec(int(f.Fd()))

# Test case for issue 47993, in which the linker crashes
# on a bad input instead of issuing an error and exiting.

# This test requires external linking, so use cgo as a proxy 
[!cgo] skip

! go build -ldflags='-linkmode=external' .
! stderr 'panic'
stderr '^.*undefined symbol in relocation.*'

-- go.mod --

module issue47993

go 1.16

-- main.go --

package main

type M struct {
	b bool
}